js: add base64 for placeholder & error in image

doric-js/lib/src/widget/image.d.ts

@@ -27,6 +27,7 @@ export declare class Image extends View {
      * Local file name
      */
     placeHolderImage?: string;
+    placeHolderImageBase64?: string;
     /**
      * Display while image is loading
      * Color
@@ -38,6 +39,7 @@ export declare class Image extends View {
      * It can be file name in local path
      */
     errorImage?: string;
+    errorImageBase64?: string;
     /**
      * Display while image is failed to load
      * Color

doric-js/lib/src/widget/image.js

@@ -61,6 +61,10 @@ __decorate([
     Property,
     __metadata("design:type", String)
 ], Image.prototype, "placeHolderImage", void 0);
+__decorate([
+    Property,
+    __metadata("design:type", String)
+], Image.prototype, "placeHolderImageBase64", void 0);
 __decorate([
     Property,
     __metadata("design:type", Color
@@ -74,6 +78,10 @@ __decorate([
     Property,
     __metadata("design:type", String)
 ], Image.prototype, "errorImage", void 0);
+__decorate([
+    Property,
+    __metadata("design:type", String)
+], Image.prototype, "errorImageBase64", void 0);
 __decorate([
     Property,
     __metadata("design:type", Color)